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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]      
Revenue $ 2,756,607 $ 2,872,421 $ 2,058,944
Segment operating income (loss) 451,899 561,889 45,292
Depreciation and amortization 397,344 382,314 403,170
Intersegment      
Segment Reporting Information [Line Items]      
Revenue (61,151) (67,428) (57,047)
Segment operating income (loss) 1,261 4,671 (6,422)
Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 2,756,607 2,872,421 2,058,944
Segment operating income (loss) 622,042 667,929 151,267
Depreciation and amortization 386,466 371,227 390,282
North America Solutions      
Segment Reporting Information [Line Items]      
Revenue 2,445,946 2,519,743 1,788,167
North America Solutions | Intersegment      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
North America Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 2,445,946 2,519,743 1,788,167
Segment operating income (loss) 610,674 625,467 121,893
Depreciation and amortization 366,446 353,976 375,250
Offshore Gulf of Mexico      
Segment Reporting Information [Line Items]      
Revenue 106,207 130,244 125,465
Offshore Gulf of Mexico | Intersegment      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
Offshore Gulf of Mexico | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 106,207 130,244 125,465
Segment operating income (loss) 12,415 22,806 23,214
Depreciation and amortization 7,530 7,622 9,175
International Solutions      
Segment Reporting Information [Line Items]      
Revenue 193,975 212,566 136,072
International Solutions | Intersegment      
Segment Reporting Information [Line Items]      
Revenue 0 0 0
International Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 193,975 212,566 136,072
Segment operating income (loss) (949) (891) (138)
Depreciation and amortization 10,863 7,615 4,156
Other      
Segment Reporting Information [Line Items]      
Revenue 10,479 9,868 9,240
Other | Intersegment      
Segment Reporting Information [Line Items]      
Revenue (61,151) (67,428) (57,047)
Other | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 71,630 77,296 66,287
Segment operating income (loss) (1,359) 15,876 12,720
Depreciation and amortization $ 1,627 $ 2,014 $ 1,701